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Title: Email this ArticlePrintable Version Fuse Rating fuse to high

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Rating:   Rating:10  Votes:1 (Rating Scale: 1 = worst, 10 = best)
Added on:  25 Feb 2008
Author/Source:  Ray Davies/ Chris Read
Author's email/website:  n/a
Posted by:  Biscuit
Comments:   1 Comment(s)

By GDPR removal 92652
27 Feb 2008
The reason one places a fuse in a circuit is to protect the wiring; not to try to protect the terminal device. The proceedure is to use the ampere loading of the terminal device to select the wire size. From the wire size one then obtains the current rating for the particular wire size and selects a fuse size to protect the wire from overloading due to a fault or other reason. A 2.5 mm2 wire will happly carry 20 amps if it is installed on its own. In a loom it is prudent to fuse down to 15 amps to allow for reduced heat dissipation. Your local wire supplier will have the ratings for all the wire stocked. Ask for the DC rating as the heat dissipation with AC is about 5 to 10 % higher and hence the rating reduces accordingly. Regards Gary Reabow.

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